Yemen has suffered its first deadly air strike of 2018 with more than 20 killed in the key port of Hodeidah on New Year's Day. Three of the world's biggest humanitarian agencies have now joined together to highlight that Yemen has passed the grim milestone of enduring more than a thousand days of war, explaining that three-quarters of the Yemeni population needs humanitarian aid. And that about two-thirds are deprived of food, water, and proper sanitation.